A Concord High School senior with a 3.6 grade point average and a starting position on the school's football team was shot to death in San Francisco's Bayview district, authorities said Monday.

Montreal Blakely, 17, was shot and killed about 10 p.m. Saturday while standing with friends on Osceola Lane. A friend took him to a hospital, where he was pronounced dead.

No one has been arrested. A police spokesman said the case remains "an active and ongoing investigation."

In Concord, school officials described Blakely as a friendly, upbeat student who transferred to Concord High last year from another nearby school and established himself in both athletics and academics.

"Montreal came in here and really worked hard," said football coach Brian Hamilton. Not only was Blakely a starting defensive back for the team, he also excelled at courses including calculus - no easy feat considering that each day started with a 7 a.m. weight training workout and ended after football practice at 6 p.m.

Concord High Principal Gary McAdam, who knew Blakely as a student at middle school, recalled him with fondness: "He always had a smile on his face when I saw him this year. His mother told me how excited he had been at coming to school, and that he had a good relationship with all his teachers."

Blakely's mother visited with members of the varsity football team Monday morning, Hamilton said. Blakely also had family and friends in the Bayview district and often visited on the weekends, acquaintances said.